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"use strict";
const { constant_types: { LUA_TNIL } } = require('./defs.js');
const lobject = require('./lobject.js');
class Proto {
constructor(L) {
this.id = L.l_G.id_counter++;
this.k = []; // constants used by the function
this.p = []; // functions defined inside the function
this.code = []; // opcodes
this.cache = null; // last-created closure with this prototype
this.lineinfo = []; // map from opcodes to source lines (debug information)
this.upvalues = []; // upvalue information
this.numparams = 0; // number of fixed parameters
this.is_vararg = false;
this.maxstacksize = 0; // number of registers needed by this function
this.locvars = []; // information about local variables (debug information)
this.linedefined = 0; // debug information
this.lastlinedefined = 0; // debug information
this.source = null; // used for debug information
}
}
const luaF_newLclosure = function(L, n) {
let c = new lobject.LClosure(L, n);
return c;
};
const luaF_findupval = function(L, level) {
return L.stack[level];
};
const luaF_close = function(L, level) {
/* Create new TValues on stack;
* any closures will keep referencing old TValues */
for (let i=level; i<L.top; i++) {
let old = L.stack[i];
L.stack[i] = new lobject.TValue(old.type, old.value);
}
};
/*
** fill a closure with new upvalues
*/
const luaF_initupvals = function(L, cl) {
for (let i = 0; i < cl.nupvalues; i++) {
cl.upvals[i] = new lobject.TValue(LUA_TNIL, null);
}
};
/*
** Look for n-th local variable at line 'line' in function 'func'.
** Returns null if not found.
*/
const luaF_getlocalname = function(f, local_number, pc) {
for (let i = 0; i < f.locvars.length && f.locvars[i].startpc <= pc; i++) {
if (pc < f.locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number === 0)
return f.locvars[i].varname.getstr();
}
}
return null; /* not found */
};
module.exports.MAXUPVAL = 255;
module.exports.Proto = Proto;
module.exports.luaF_findupval = luaF_findupval;
module.exports.luaF_close = luaF_close;
module.exports.luaF_getlocalname = luaF_getlocalname;
module.exports.luaF_initupvals = luaF_initupvals;
module.exports.luaF_newLclosure = luaF_newLclosure;
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